diff --git a/native/src/defines.h b/native/src/defines.h
index ddd65c9..0d1f037 100644
--- a/native/src/defines.h
+++ b/native/src/defines.h
@@ -135,7 +135,7 @@
 #define SUGGEST_WORDS_WITH_TRANSPOSED_CHARACTERS true
 
 // The following "rate"s are used as a multiplier before dividing by 100, so they are in percent.
-#define WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE 75
+#define WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE 100
 #define WORDS_WITH_MISSING_SPACE_CHARACTER_DEMOTION_RATE 80
 #define WORDS_WITH_EXCESSIVE_CHARACTER_DEMOTION_RATE 75
 #define WORDS_WITH_EXCESSIVE_CHARACTER_OUT_OF_PROXIMITY_DEMOTION_RATE 75
diff --git a/native/src/unigram_dictionary.cpp b/native/src/unigram_dictionary.cpp
index 9aa36b0..17a87a7 100644
--- a/native/src/unigram_dictionary.cpp
+++ b/native/src/unigram_dictionary.cpp
@@ -457,10 +457,17 @@
 }
 inline int UnigramDictionary::calculateFinalFreq(const int inputIndex, const int depth,
         const int matchWeight, const int skipPos, const int excessivePos, const int transposedPos,
-        const int freq, const bool sameLength) {
+        const int freq, const bool sameLength) const {
     // TODO: Demote by edit distance
     int finalFreq = freq * matchWeight;
-    if (skipPos >= 0) multiplyRate(WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE, &finalFreq);
+    if (skipPos >= 0) {
+        if (mInputLength >= 3) {
+            multiplyRate(WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE *
+                    (mInputLength - 2) / (mInputLength - 1), &finalFreq);
+        } else {
+            finalFreq = 0;
+        }
+    }
     if (transposedPos >= 0) multiplyRate(
             WORDS_WITH_TRANSPOSED_CHARACTERS_DEMOTION_RATE, &finalFreq);
     if (excessivePos >= 0) {
@@ -514,7 +521,7 @@
 }
 
 inline bool UnigramDictionary::existsAdjacentProximityChars(const int inputIndex,
-        const int inputLength) {
+        const int inputLength) const {
     if (inputIndex < 0 || inputIndex >= inputLength) return false;
     const int currentChar = *getInputCharsAt(inputIndex);
     const int leftIndex = inputIndex - 1;
diff --git a/native/src/unigram_dictionary.h b/native/src/unigram_dictionary.h
index a959845..2912cb0 100644
--- a/native/src/unigram_dictionary.h
+++ b/native/src/unigram_dictionary.h
@@ -71,7 +71,8 @@
             const int nextLettersSize);
     void registerNextLetter(unsigned short c, int *nextLetters, int nextLettersSize);
     int calculateFinalFreq(const int inputIndex, const int depth, const int snr, const int skipPos,
-            const int excessivePos, const int transposedPos, const int freq, const bool sameLength);
+            const int excessivePos, const int transposedPos, const int freq,
+            const bool sameLength) const;
     void onTerminalWhenUserTypedLengthIsGreaterThanInputLength(unsigned short *word,
             const int inputIndex, const int depth, const int snr, int *nextLetters,
             const int nextLettersSize, const int skipPos, const int excessivePos,
@@ -95,8 +96,8 @@
     bool processCurrentNodeForExactMatch(const int firstChildPos,
             const int startInputIndex, const int depth, unsigned short *word,
             int *newChildPosition, int *newCount, bool *newTerminal, int *newFreq, int *siblingPos);
-    bool existsAdjacentProximityChars(const int inputIndex, const int inputLength);
-    inline const int* getInputCharsAt(const int index) {
+    bool existsAdjacentProximityChars(const int inputIndex, const int inputLength) const;
+    inline const int* getInputCharsAt(const int index) const {
         return mInputCodes + (index * MAX_PROXIMITY_CHARS);
     }
     const unsigned char *DICT;